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mxf: Introduce ff_mxf_get_samples_per_frame 

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Matthieu Bouron 2012-09-20 20:31:28 +02:00 committed by Luca Barbato
parent d48430c367
commit e118bb1a33
2 changed files with 47 additions and 0 deletions
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40
libavformat/mxf.c
View File

@ -106,3 +106,43 @@ int ff_mxf_decode_pixel_layout(const char pixel_layout[16], enum AVPixelFormat *
return -1;
}
static const MXFSamplesPerFrame mxf_spf[] = {
{ { 1001, 24000 }, { 2002, 0, 0, 0, 0, 0 } }, // FILM 23.976
{ { 1, 24}, { 2000, 0, 0, 0, 0, 0 } }, // FILM 24
{ { 1001, 30000 }, { 1602, 1601, 1602, 1601, 1602, 0 } }, // NTSC 29.97
{ { 1001, 60000 }, { 801, 801, 801, 801, 800, 0 } }, // NTSC 59.94
{ { 1, 25 }, { 1920, 0, 0, 0, 0, 0 } }, // PAL 25
{ { 1, 50 }, { 960, 0, 0, 0, 0, 0 } }, // PAL 50
};
static const AVRational mxf_time_base[] = {
{ 1001, 24000 },
{ 1, 24},
{ 1001, 30000 },
{ 1001, 60000 },
{ 1, 25 },
{ 1, 50 },
{ 0, 0}
};
const MXFSamplesPerFrame *ff_mxf_get_samples_per_frame(AVFormatContext *s,
AVRational time_base)
{
int idx = av_find_nearest_q_idx(time_base, mxf_time_base);
AVRational diff = av_sub_q(time_base, mxf_time_base[idx]);
diff.num = abs(diff.num);
if (av_cmp_q(diff, (AVRational){1, 1000}) >= 0)
return NULL;
if (av_cmp_q(time_base, mxf_time_base[idx]))
av_log(s, AV_LOG_WARNING,
"%d/%d input time base matched %d/%d container time base\n",
time_base.num, time_base.den,
mxf_spf[idx].time_base.num,
mxf_spf[idx].time_base.den);
return &mxf_spf[idx];
}

7
libavformat/mxf.h
View File

@ -21,6 +21,7 @@
#ifndef AVFORMAT_MXF_H
#define AVFORMAT_MXF_H
#include "avformat.h"
#include "libavcodec/avcodec.h"
#include <stdint.h>
@ -66,11 +67,17 @@ typedef struct MXFCodecUL {
int id;
} MXFCodecUL;
typedef struct MXFSamplesPerFrame {
struct AVRational time_base;
int samples_per_frame[6];
} MXFSamplesPerFrame;
extern const MXFCodecUL ff_mxf_data_definition_uls[];
extern const MXFCodecUL ff_mxf_codec_uls[];
extern const MXFCodecUL ff_mxf_pixel_format_uls[];
int ff_mxf_decode_pixel_layout(const char pixel_layout[16], enum AVPixelFormat *pix_fmt);
const MXFSamplesPerFrame *ff_mxf_get_samples_per_frame(AVFormatContext *s, AVRational time_base);
#define PRINT_KEY(pc, s, x) av_dlog(pc, "%s %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", s, \
(x)[0], (x)[1], (x)[2], (x)[3], (x)[4], (x)[5], (x)[6], (x)[7], (x)[8], (x)[9], (x)[10], (x)[11], (x)[12], (x)[13], (x)[14], (x)[15])